Update the JavaScript Algorithms and Data Structures (Beta) step 97

We are unable to see the preview of what we are coding.
I suggest to the update of gold to 100, before doing
the rest. It will allows the preview to reflect the code.

JavaScript Algorithms and Data Structures (Beta) https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures-v8/learn-basic-javascript-by-building-a-role-playing-game/step-97

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